Calibration soundcard

lorrain

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Sep 28, 2020
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Hi
I am a new user of REW and I use it for testing amplifiers and tape recorders. This software is fantastic for that. I widely use the sweep sine function for bandwidth measurements with frequencies from 10Hz to 20KHz .
By looping my soundcard output to input, I should find the same calibration curve and measurement curve for frequencies set from 0 to 20KHz.But, I notice that below 10 Hz, the calibration curve does not match with the measurement curve. When analyzing with a scope, the calibration sweep starts lower in frequency. Is there a reason for this? I note that the sweep emitted in measurement and by the generator is identical (under the same conditions ).
Only the calibration curve is different.
I tested all the possible settings but with the same result.
This difference below 10Hz is not a problem. I'm just amazed at this difference
Eric.
 

John Mulcahy

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Apr 3, 2017
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I'm not really following what difference you are referring to, perhaps you could post an mdat file. The measurement sweep range is explained in the help.
 

lorrain

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Joined
Sep 28, 2020
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Hi,John
Thank you for your reply.
I will redo the manipulations and I will get back to you as soon as possible

Regards, eric
 
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